<!doctype html>
<html> 
 <head> 
  <meta charset="utf-8"> 
  <meta http-equiv="Cache-Control" content="no-siteapp"> 
  <meta http-equiv="Cache-Control" content="no-transform"> 
  <meta name="applicable-device" content="pc,mobile"> 
  <meta name="viewport" content="width=device-width, initial-scale=1"> 
  <title>桌面时钟_在线极简时钟同步</title> 
  <meta name="keywords" content="桌面时钟,在线时钟,极简时钟,时钟同步"> 
  <meta name="description" content="北京时间网提供桌面时钟，在线极简同步时钟。"> 
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8"> 
 </head> 
 <body> 
<style>
body {
    background: #fff;
}
.clock {

	position: absolute;

	opacity: 1

}
.fill .clock {

	left: 50%;

	top: 50%

}
.centre {

	position: absolute;

	top: 50%;

	left: 50%;

	width: 0;

	height: 0

}
.expand {

	position: absolute;

	top: 0;

	left: 0;

	transform: translate(-50%, -50%)

}
.anchor {

	position: absolute;

	top: 0;

	left: 0;

	width: 0;

	height: 0

}
.element {
	position: absolute;
	top: 0;
	left: 0
}
.round {
	border-radius: 296px
}
.circle-1 {

	background: #000;

	width: 12px;

	height: 12px

}
.circle-2 {

	background: #000;

	width: 8px;

	height: 8px

}
.circle-3 {

	background: red;

	width: 4px;

	height: 4px

}
.second {
	transform: rotate(180deg)
}
.minute {
	transform: rotate(54deg)
}
.second-hand {
	width: 2px;
	height: 150px;
	background: red;
	transform: translate(-50%, -100%) translateY(24px)
}
.hour {
	transform: rotate(304.5deg)
}



.light .thin-hand {

	width: 4px;

	height: 50px;

	background: #000;

	transform: translate(-50%, -100%)

}

.night .thin-hand {

	width: 4px;

	height: 50px;

	background: #fff;

	transform: translate(-50%, -100%)

}

.light .fat-hand {

	width: 10px;

	height: 57px;

	border-radius: 10px;

	background: #000;

	transform: translate(-50%, -100%) translateY(-18px)

}

.night .fat-hand {

	width: 10px;

	height: 57px;

	border-radius: 10px;

	background: #fff;

	transform: translate(-50%, -100%) translateY(-18px)

}

.minute-hand {
	height: 88px
}



.light .hour-text {

	position: absolute;

	font: 40px Hei, Helvetica, Arial, sans-serif;

	color: #000;

	transform: translate(-50%, -50%)

}

.night .hour-text {

	position: absolute;

	font: 40px Hei, Helvetica, Arial, sans-serif;

	color: #fff;

	transform: translate(-50%, -50%)

}

.hour-10 {
	padding-left: .4ex
}

.hour-11 {
	padding-left: .25ex
}

.light .minute-text {

	position: absolute;

	font: 12px Avenir Next, Helvetica, Arial, sans-serif;

	color: #000;

	transform: translate(-50%, -50%)

}

.night .minute-text {

	position: absolute;

	font: 12px Avenir Next, Helvetica, Arial, sans-serif;

	color: #fff;

	transform: translate(-50%, -50%)

}

.light .minute-line {

	background: #000;

	width: 1px;

	height: 9px;

	transform: translate(-50%, -100%) translateY(-131px);

	opacity: .34

}

.night .minute-line {

	background: #fff;

	width: 1px;

	height: 9px;

	transform: translate(-50%, -100%) translateY(-131px);

	opacity: .34

}
</style>
<div class="light" id="myclock">
  <div class="fill"> 
   <div class="reference"></div> 
   <div class="clock" id="utility-clock"> 
    <div class="centre"> 
     <div class="dynamic"></div> 
     <div class="expand round circle-1"></div> 
     <div class="anchor hour"> 
      <div class="element thin-hand"></div> 
      <div class="element fat-hand"></div> 
     </div> 
     <div class="anchor minute"> 
      <div class="element thin-hand"></div> 
      <div class="element fat-hand minute-hand"></div> 
     </div> 
     <div class="anchor second"> 
      <div class="element second-hand"></div> 
     </div> 
     <div class="expand round circle-2"></div> 
     <div class="expand round circle-3"></div> 
    </div> 
   </div> 
  </div> 
  </div>
  <script>   
var clock = document.querySelector('#utility-clock')

utilityClock(clock)

if (clock.parentNode.classList.contains('fill')) autoResize(clock, 295 + 32)

function utilityClock(container) {

	var dynamic = container.querySelector('.dynamic')

	var hourElement = container.querySelector('.hour')

	var minuteElement = container.querySelector('.minute')

	var secondElement = container.querySelector('.second')

	var minute = function(n) {

		return n % 5 == 0 ? minuteText(n) : minuteLine(n)

	}

	var minuteText = function(n) {

		var element = document.createElement('div')

		element.className = 'minute-text'

		element.innerHTML = (n < 10 ? '0' : '') + n

		position(element, n / 60, 135)

		dynamic.appendChild(element)

	}

	var minuteLine = function(n) {

		var anchor = document.createElement('div')

		anchor.className = 'anchor'

		var element = document.createElement('div')

		element.className = 'element minute-line'

		rotate(anchor, n)

		anchor.appendChild(element)

		dynamic.appendChild(anchor)

	}

	var hour = function(n) {

		var element = document.createElement('div')

		element.className = 'hour-text hour-' + n

		element.innerHTML = n

		position(element, n / 12, 105)

		dynamic.appendChild(element)

	}

	var position = function(element, phase, r) {

		var theta = phase * 2 * Math.PI

		element.style.top = (-r * Math.cos(theta)).toFixed(1) + 'px'

		element.style.left = (r * Math.sin(theta)).toFixed(1) + 'px'

	}

	var rotate = function(element, second) {

		element.style.transform = element.style.webkitTransform = 'rotate(' + (second * 6) + 'deg)'

	}

	var animate = function() {

		var now = new Date()

		var time = now.getHours() * 3600 +

			now.getMinutes() * 60 +

			now.getSeconds() * 1 +

			now.getMilliseconds() / 1000

		rotate(secondElement, time)

		rotate(minuteElement, time / 60)

		rotate(hourElement, time / 60 / 12)

		requestAnimationFrame(animate)

	}

	for (var i = 1; i <= 60; i++) minute(i)

	for (var i = 1; i <= 12; i++) hour(i)

	animate()

}



function autoResize(element, nativeSize) {

	var update = function() {

		var scale = Math.min(window.innerWidth, window.innerHeight) / nativeSize

		element.style.transform = element.style.webkitTransform = 'scale(' + scale.toFixed(3) + ')'

	}

	update()

	window.addEventListener('resize', update)

}

//自动反色
function darkModeHandler() {
    const mediaQuery = window.matchMedia('(prefers-color-scheme: dark)');
    if (mediaQuery.matches) {
     document.querySelector('body').setAttribute('style', 'background-color:#1b1b1b');
      let div = document.querySelector('#myclock');
      div.className="night";
    }
   }
   
   darkModeHandler();
</script>  
 </body>
</html>